If you are looking for acclaimed written accounts of the actual Battle of Verdun (1916), these are widely considered the gold standard:
by Ian Ousby: Provides a great introduction to the French perspective and the physical landscape of the battle.
: It is remembered as a "meat grinder" that wiped out entire generations, with over 1.7 million French casualties during WWI.
by Alistair Horne: Frequently cited as the definitive English-language account of the battle.
: Players often cite the German pre-game speeches as highly immersive "good text." One famous line translates to: "We have raised the veil of hell. Let us show these disloyal dogs who the real devils are. Fight until the ground is soaked with their blood. Attack!" .